JPS59228484A - Printer device for television signal - Google Patents

Abstract

PURPOSE:To print out a picture on a television screen correctly by outputting a gradational density signal as print data to a printer when a vertical synchronizing signal coincides with a copy command signal. CONSTITUTION:A synchronizing separating circuit 7 extracts horizontal and vertical synchronizing signals s1 and s2 from a composite video signal v1 from a television receiver to obtain a video signal v2, which is inputted to an A/D converter 1. The converter 1 uses pulse (p) of a clock pulse generating circuit 9 to sample the signal v2, and the gradational density signal d1. When a copy key 6 is turned on, a copy command is supplied through a CPU4, and a write command is outputted to a write control circuit 3 when the vertical synchronizing signal s2 coincides with the copy command signal c2. The control circuit 3 writes the gradational density signal in a video signal 2. When the writing is completed, the CPU4 reads the gradational density signal and outputs it as print data to a printer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer device for television signal.

Generally, when a cooking program is being broadcast on a television receiver, you may want to write down the menu list and ingredients displayed on one screen, but with a conventional television receiver, you may not be able to watch it. This was extremely inconvenient as the person had to take notes on the menu list, ingredients, etc. while looking at the screen each time. Also the cooking program mentioned above! If it is recorded on a kVTR, it can be played back again, but even in that case, it is necessary to search for the necessary screen and play it back, which is a cumbersome operation.

Therefore, the inventor developed the gradation density signal of the image on the TV screen!
1-By writing to RAM and then reading it,
We have already developed a printer device for television receivers that can automatically print hard copies of images on the television screen.

However, in the printer device of this television receiver, since the copy command is an unspecified signal, there are many problems in reproducing normal images.

The present invention has been made to eliminate all of the above-mentioned drawbacks, and provides a printer device that reproduces normal images using a vertical synchronization signal and a copy command signal.

An embodiment of the present invention will be described below with reference to the drawings.

The drawing shows a television signal printer apparatus according to an embodiment of the present invention. In FIG. 1, 7 is a synchronization separation circuit for separating horizontal and vertical synchronization signals s1 and s2 from a composite video signal v1 from a television receiver; 8; is an AFC circuit that applies automatic frequency control (hereinafter referred to as AFC) to the horizontal synchronization signal sl.

1 is the video signal v2ffiA from the synchronization separation circuit 7.
/D converted 1, for example, 4-bit gradation density signal alt-l
2 is a video memory that stores the entire gradation density signal dl; 3 is a video memory that stores the entire gradation density signal dl; 3 writes to the video memory 2 in response to a write command C3 using the AFC circuit output sl' and vertical synchronization signal S2; A write control circuit 4 is a CPU that performs control, which gives a copy command c2i for one vertical scanning period in response to a copy command cl from a copy key 6, outputs a read address af to the video memory 2, and outputs a read address af to the video memory 2. Read data d2ffi is output as print data d3. 5 is a printer that prints out the read print data d3. Further, 9 is a clock pulse generation circuit that supplies a clock pulse p to the A/D converter 1 and the write control circuit 3, and 10 is driven by the copy command c score and vertical synchronization signal s2 of the CPU 4, and is driven by the write command C3.
This is a latch circuit that supplies the data to the write control circuit 3.

Next, the operation will be explained. From the composite video signal vl from the television receiver, horizontal and vertical synchronizing signals sl and s2 are extracted by the synchronization separation circuit 7, and the resulting video signal v2 is input to the A/D converter 1. The A/D
The converter 1 samples the video signal v2Q using the clock pulse p of the clock pulse generation circuit 9, and outputs the gradation density signal d1.

On the other hand, the latch circuit 10 detects the rise of the vertical synchronizing signal s2ω as shown in FIG. 2, and when the copy key 6 is turned on, the copy command c
2(c) is supplied, and the vertical synchronization signal s2 and copy command c
2, the write command c3 (dli) is output to the write control circuit 3. Therefore, the write control circuit 3 outputs the gradation density signal d1 to the clock pulse p.
It is written to the video memory 2 at the timing of . The write control circuit 3 performs control so that gradation density signals for 280 pixels in the horizontal direction and 234 fins in the vertical direction are written to the correct address in the video memory 2.

When the writing to the video memory 2 is completed, the CPU 4 gives the read address af to the video memory 2 '1, and reads out the gradation density signal d2. This gradation density signal d2 is the print data d3
As a result, the printer 5 prints out the image on the television screen. That is, the print of the image is formed in accordance with the vertical synchronization signal, making it possible to reproduce the entire image normally.

In this embodiment, the device receives the color composite video signal from the television receiver itself, and synchronously separates this signal inside the printer to obtain the video signal and horizontal and vertical synchronization signals. It can be connected with just one cable to the video output terminal that is often installed on John receivers these days.

As described above, the television signal printer device according to the present invention has the effect of correctly printing out images on a television screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a printer apparatus for television signals according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram of main parts in FIG. 1. 1...A/D converter, 2...video memory, 8...
AFC circuit, 3...Write control circuit, 4...CPU
(readout control circuit), 5... printer, 10...
It is a latch circuit. Agent Masuo Oiwa

Claims (1)

[Claims] (1) A printer device that prints out a video signal based on a television composite video signal, comprising an A/D converter that performs video signal A/D conversion of the composite video signal, and the A/D converter that performs A/D conversion of the video signal of the composite video signal;
a video memory that stores the gradation density signal from the D converter;
A copy key that issues a print command; a latch circuit that detects the vertical synchronization signal of the composite video signal and outputs a write command based on the operation of the copy key; and the output of this latch circuit controls the writing of the video memory. What is claimed is: 1. A printer for television signals, comprising: a write control circuit for reading the gradation density signal from the video memory; a readout control circuit for reading out the gradation density signal from the video memory; and a printer for printing out the read gradation density signal.